EP 0312931 B1 19930421 - PROCESS FOR THE PREPARATION OF AMINO-1,3 BENZENEDIOL
Title (en)
PROCESS FOR THE PREPARATION OF AMINO-1,3 BENZENEDIOL
Publication
Application
Priority
US 11075487 A 19871019
Abstract (en)
[origin: EP0312931A2] High purity amino-1,3-benzenediols are prepared by (a) contacting a 1,3-bis(alkylcarbonato)benzene with a nitrating agent under reaction conditions such that a 1,3-bis(alkylcarbonato)nitrobenzene is formed, (b) contacting the 1,3-bis(alkylcarbonato)nitrobenzene with a hydrolyzing agent under conditions such that a nitro-1,3-benzenediol is produced, and (c) contacting the nitro-1,3-benzenediol with a reducing agent under conditions such that an amino-1,3-benzenediol is produced. Of the amino-1,3-benzenediols, 4,6-diamino-1,3-benzenediol is particularly useful in the preparation of high molecular weight polybenzoxazoles.
IPC 1-7
IPC 8 full level
B01J 27/02 (2006.01); C07B 61/00 (2006.01); C07C 201/08 (2006.01); C07C 201/12 (2006.01); C07C 205/21 (2006.01); C07C 205/23 (2006.01); C07C 205/43 (2006.01); C07C 213/00 (2006.01); C07C 213/02 (2006.01); C07C 215/76 (2006.01); C07C 215/78 (2006.01)
CPC (source: EP KR US)
C07C 205/23 (2013.01 - EP US); C07C 205/43 (2013.01 - EP US); C07C 205/59 (2013.01 - KR); C07C 215/74 (2013.01 - KR)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0312931 A2 19890426; EP 0312931 A3 19900627; EP 0312931 B1 19930421; AT E88459 T1 19930515; BR 8805394 A 19890620; CA 1318916 C 19930608; DE 3880424 D1 19930527; DE 3880424 T2 19931021; DK 580688 A 19890420; DK 580688 D0 19881018; ES 2053672 T3 19940801; FI 884804 A0 19881018; FI 884804 A 19890420; IL 88061 A0 19890630; JP 2690333 B2 19971210; JP H02136 A 19900105; KR 890006564 A 19890614; KR 910009326 B1 19911111; NO 884637 D0 19881018; NO 884637 L 19890420; US 4912246 A 19900327
DOCDB simple family (application)
EP 88117107 A 19881014; AT 88117107 T 19881014; BR 8805394 A 19881014; CA 580358 A 19881017; DE 3880424 T 19881014; DK 580688 A 19881018; ES 88117107 T 19881014; FI 884804 A 19881018; IL 8806188 A 19881017; JP 26072988 A 19881018; KR 880013485 A 19881015; NO 884637 A 19881018; US 11075487 A 19871019